Ch. 2 Physical and Chemical Properties/Changes

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29 Νοε 2013 (πριν από 3 χρόνια και 10 μήνες)

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Ch.
2 Physical
and Chemical
Properties/Changes

Properties


Physical Property


can be observed
without

changing

the identity of the substance


color


texture




density


viscosity


change in state


solubility


malleability


mass


volume




Chemical Property


describes the ability of a substance
to undergo
changes

in identity


A new substance is produced


reactivity


toxicity


pH


conductivity


tarnishing


fermenting


oxidation





There are properties that are used to describe matter.


Examples:


viscosity


reactivity


density


solubility


tarnishing


physical

chemical

physical

physical

chemical

Properties


Matter’s Changes


Physical Change


properties remain the same


changes the form of a substance without changing
its identity


All changes in state!

(freeze, melt, condense,
evaporate, and sublimate)


Examples:


Boil, dissolve, break, split, crack, grind, cut, crush, and
bend.


Chemical Change


changes the identity of a substance


a new substance is produced


Examples:


rust, rot, burn, decompose, corrode, oxidize, ferment,
and explode!


Evidence of a chemical change:


change in color or odor, formation of a gas, formation
of a precipitate (solid), change in light or heat

Matter’s
Changes


A
physical change

during
digestion is the mechanical
breaking up of food by teeth.



A
chemical change

during
digestion is the chemical breaking
down of food in the mouth,
stomach and small intestine with
the aide of enzymes.


Matter’s Changes


Examples:


rusting iron


dissolving in water


burning a log


melting wax


grinding spices


chemical

physical

chemical

physical

physical

Matter’s
Changes

Physical & Chemical Changes Game

Physical & Chemical Changes Game

Physical & Chemical Changes Game

Physical & Chemical Changes Game

Physical & Chemical Changes Game

Physical & Chemical Changes Game

Physical & Chemical Changes Game

Physical & Chemical Changes Card Game

Physical & Chemical Changes Game

Physical & Chemical Changes Game

Physical & Chemical Changes Game

Physical & Chemical Changes Game

Physical & Chemical Changes Game

Physical & Chemical Changes Game

Physical & Chemical Changes Game

Physical & Chemical Changes Game

Learning Check

Which of the following changes involved in
manufacturing an automobile is a chemical change?


a. applying paint to the body of the automobile

b. making plastics from petroleum products

c. making steel from iron, carbon, and other metals

d. rolling out steel into sheets

Learning Check

Which of the following is a physical change?


a. aluminum oxidizing

b. an acid and a base forming a salt and water

c. ice cream melting

d. paper burning

Learning Check

In the rock cycle, which of these is a chemical

change involved with the formation of igneous

rocks?

F
Compression of sediments

G
Heat loss from lava

H
Subduction of plates

J

Formation of minerals